1px border #0082c9 around tray window

Signed-off-by: Dominique Fuchs <32204802+DominiqueFuchs@users.noreply.github.com>

src/gui/tray/Window.qml

@@ -73,6 +73,7 @@ Window {
         id: trayWindowBackground
         anchors.fill: parent
         radius: 10
+        border.color: "#0082c9"
 
         Rectangle {
             id: trayWindowHeaderBackground